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A general description is here.
‘R CMD check’ notes when S4-style exports are used without declaring a strong dependence on package ‘methods’.
‘tools::checkRd()’ (used by ‘R CMD check’) detects more problems with \Sexpr-based dynamic content, including bad nesting of \Sexprs and invalid arguments.
‘tools::checkRd()’ now reports Rd titles and section names ending in a period; this is ignored by ‘R CMD check’ unless environment variable ‘_R_CHECK_RD_CHECKRD_MINLEVEL_’ is set to -5 or smaller.
‘tools::checkRd()’ no longer produces spurious notes about “unnecessary braces” from multi-line Rd results of \Sexpr macros.
Rd \Sexpr macros with nested #ifdef conditionals were not processed.